Sofa



1.1 is a perspective view;

1.2 is a right side view thereof;

1.3 is a left side view thereof;

1.4 is a front view thereof;

1.5 is a rear view thereof;

1.6 is a top view thereof; and

1.7 is a bottom view thereof. 

CLAIM The ornamental design for a sofa, as shown and described. 